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24-bit 192kHz Stereo DAC
DESCRIPTION
The WM8761 is a high performance stereo DAC designed
for audio applications such as DVD, home theatre systems,
and digital TV. The WM8761 supports data input word
lengths from 16 to 24-bits and sampling rates up to 192kHz.
The WM8761 consists of a serial interface port, digital
interpolation filters, multi-bit sigma delta modulators and
stereo DAC in a 14-pin SOIC package.
The WM8761 has a hardware control interface for selection
of audio data interface format, mute and de-emphasis. The
2
WM8761 supports I S, right justified or DSP interfaces.
The WM8761 is an ideal device to interface to AC-3,
DTS, and MPEG audio decoders for surround sound
applications, or for use in DVD players, including supporting
the implementation of 2 channels at 192kHz for high-end
DVD-Audio applications.
WM8761
FEATURES
Stereo DAC
Audio Performance
-
100dB SNR (‘A’ weighted @ 48kHz)
-
-90dB THD
DAC Sampling Frequency: 8kHz – 192kHz
Pin Selectable Audio Data Interface Format
-
16 to 24-bit I S, 24-bit Right Justified or DSP
2.7V - 5.5V Supply Operation
14-pin SOIC Package
Pin Compatible with WM8725 & WM8726
2
APPLICATIONS
DVD Players
Home Theatre Systems
Digital TV
Digital Set Top Boxes
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Production Data, October 2011, Rev 4.6
Copyright
2011
Wolfson Microelectronics plc.
WM8761
Production Data
TABLE OF CONTENTS
DESCRIPTION ............................................................................................................ 1
FEATURES ................................................................................................................. 1
APPLICATIONS.......................................................................................................... 1
BLOCK DIAGRAM ..................................................................................................... 1
TABLE OF CONTENTS .............................................................................................. 2
PIN CONFIGURATION ............................................................................................... 3
ORDERING INFORMATION ....................................................................................... 3
PIN DESCRIPTION ..................................................................................................... 4
ABSOLUTE MAXIMUM RATINGS ............................................................................. 5
DC ELECTRICAL CHARACTERISTICS .................................................................... 6
ELECTRICAL CHARACTERISTICS .......................................................................... 6
TERMINOLOGY ....................................................................................................................7
MASTER CLOCK TIMING .....................................................................................................8
DIGITAL AUDIO INTERFACE ...............................................................................................8
POWER ON RESET (POR) ...................................................................................................9
DEVICE DESCRIPTION ........................................................................................... 11
GENERAL INTRODUCTION ...............................................................................................11
DAC CIRCUIT DESCRIPTION ............................................................................................11
CLOCKING SCHEMES .......................................................................................................12
DIGITAL AUDIO INTERFACE .............................................................................................12
AUDIO DATA SAMPLING RATES ......................................................................................14
HARDWARE CONTROL MODES .......................................................................................15
DIGITAL FILTER CHARACTERISTICS ..............................................................................17
DAC FILTER RESPONSES ................................................................................................17
DIGITAL DE-EMPHASIS CHARACTERISTICS ....................................................... 18
APPLICATIONS INFORMATION ............................................................................. 19
RECOMMENDED EXTERNAL COMPONENTS .................................................................19
RECOMMENDED EXTERNAL COMPONENTS VALUES ..................................................19
RECOMMENDED ANALOGUE LOW PASS FILTER ..........................................................20
PCB LAYOUT RECOMMENDATIONS ................................................................................20
PACKAGE DRAWING .............................................................................................. 21
IMPORTANT NOTICE .............................................................................................. 22
ADDRESS: ..........................................................................................................................22
REVISION HISTORY ................................................................................................ 23
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WM8761
Production Data
PIN CONFIGURATION
LRCIN
DIN
BCKIN
NC
CAP
VOUTR
GND
1
2
3
4
5
6
7
14
13
12
MCLK
FORMAT
DEEMPH
NC
MUTE
VOUTL
VDD
WM8761
11
10
9
8
ORDERING INFORMATION
DEVICE
WM8761CGED
WM8761CGED/R
Note:
Reel quantity = 3,000
TEMPERATURE
RANGE
-40 to +85 C
-40 to +85 C
o
o
PACKAGE
14-lead SOIC
(Pb-free)
14-lead SOIC
(Pb-free, tape and reel)
MOISTURE SENSITIVITY
LEVEL
MSL1
MSL1
PEAK SOLDERING
TEMPERATURE
260 C
260 C
o
o
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WM8761
Production Data
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
9
10
NAME
LRCIN
DIN
BCKIN
NC
CAP
VOUTR
GND
VDD
VOUTL
MUTE
TYPE
Digital input
Digital input
Digital input
No connect
Analogue output
Analogue output
Supply
Supply
Analogue output
Digital input
Sample rate clock input
Serial audio data input
Bit clock input
No internal connection
Analogue internal reference
Right channel DAC output
Negative supply
Positive supply
Left channel DAC output
Soft mute control, Internal pull down
High Impedance = Automute
High = Mute ON
Low = Mute OFF
11
12
NC
DEEMPH
No connect
Digital input
No internal connection
De-emphasis select, Internal pull up
High = de-emphasis ON
Low = de-emphasis OFF
13
FORMAT
Digital input
Data input format select, Internal pull up
Low = 24-bit right justified or DSP ‘late’
High = 16-24-bit I S or DSP ‘early’
14
Note:
1.
Digital input pins have Schmitt trigger input buffers.
MCLK
Digital input
Master clock input
2
DESCRIPTION
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WM8761
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ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
Supply voltage
Voltage range digital inputs
Master Clock Frequency
Operating temperature range, T
A
Storage temperature after soldering
-40C
-65C
MIN
-0.3V
GND -0.3V
MAX
+7V
VDD +0.3V
50MHz
+85C
+150C
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